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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9feaff9d2c69fed1478e008550270b79b61ca88b06a81150d327862ed602d765' 
  AND token = 'w3QzyRP1Ux77JPDJ2ld7bE1DI3htSh+8Og0kVUvu/xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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