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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0642f41a0224ed1c5e8466b9f7194ba40406702a019a68b3eb5673f6058cb6e' 
  AND token = 'rw7jv82jU0qdwa2CkFubKQ6QRBJOmQOW13hcEZA6x5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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