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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c819bdec8df6974cc5baf646ea9c9c8646df7913a6bc6c6aeef176c7a69e96d' 
  AND token = 'dVVSU0rY+lyJoINNg5ECWYMDl/xSCH9yid/ebJUHG4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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