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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b17d880f1f1fa8f9e2fd5bdfa748db19ad021b9d0a3c46089c5c07d50b2693f' 
  AND token = '7aZXk8la0nGC013cW07WtpjR2CbgfZyTdoTO50iObcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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