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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47100c7f546bbc92be4065d5f9fdf0bfda3663b5d4f353e9087f7754a39241b4' 
  AND token = 'y6hyk/R6sQbrgbK/T3GGAn22ISrCOBqJBXB2KBHfE4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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