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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d75179fa4c35da3cf900b182a4b66438fdac8d419c7e4d6951c3b8f352699af' 
  AND token = '37oezxxZOnYUmgTC5uYe9TFE8J36PllhvPN07rF/p3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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