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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae78c915ffc0fad38393d3c6d3c5303eeaa563ce17a99371672ecd88d3a6e8b' 
  AND token = 'kA7NBdzDpqx7RfFTYrV7zlvZ24NXYx2xn/G5L9cagDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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