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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f980043d95676a1aea1228e55ea0b0b0dbb7060fc4ea9274eef4872cf33177' 
  AND token = 'VhslTg18V4ZXYW0EJLvEnFqLCmq7YdRjlJ9uEQHE3q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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