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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915f0ad4e2aade07489fefd79911868a4c503a3905722b13982b588cf8e55e56' 
  AND token = 'tBnEZ/54w53imHi6uhZlxHfvqLa6oV5iGkQDR+k5RMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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