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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f63912952f51c391a5104aaca9a533c8375ec02055527c8b91b99a6b56eb52' 
  AND token = 'sOXIHptoDWhK6jbzYTsAqVsJBb5KO9ORJ+d/RO8dVQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}