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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a573093c1eedbbe16336d80d3c16ffd6cfcae09d0052f8d6cd97a6383b134e24' 
  AND token = 'Ny4Nnh4Vsq2kr22hsqS5nhZuMQW5PmvCu4XALmxBZls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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