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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97346f6d5b2d43b88e1cbf4122eb67030604e5aa0c9383df8adca60d943d6fd3' 
  AND token = '5TLFkqXN5E3V/FDB50IB9hgSBXA4YqWJ5AWNB7o5AcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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