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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab3283f1b1a11b6f51b72b188d34337bdedfa527b89ee78441c8b3149560003' 
  AND token = 'X/e9STmUQa6jnxWxz1SY3nB4nrb9EQLpBJDgjfGqzqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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