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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0d3f65192ff1a6af869246e711d35c8757b4ddb8845fe0aa90380c18d8905e' 
  AND token = 'Ol3q5muEfRmlJrjJKR98LhC+SodDUT9x9a0O0pal9IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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