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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94aa9614729da0d57d1a2512785a03443e2b9a48cae6c782bf2d3cebb7e07e7' 
  AND token = 'RhCnbNcFUzifhcF2Zi8Ss5RhuDr90xwMYrYcK24431I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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