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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bc84d18e97dc082fda1503d68535b9c334a349ca4372f29b77e5e99d478f6a' 
  AND token = 'DKMcNLbdtoKmbOG64eV2DYAG3voPqkPjMar1K84tT4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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