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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a0e458d4246b0bf555afaae34a2ffb5de531d2c26c17a4ea55e6855ac4496c' 
  AND token = '0IyCQZhNDVVQbVhjEni0v9YmK73hTvWzXUHF55At/WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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