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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3bc33ec9f7ddedea8e9845ba3a161e7ef4a7702ccdf82eb6aeaed829647a3a' 
  AND token = 'DMdivjWxaFXdDHMRZIvyCc8nBsbbLqB00j8Gfcs5zc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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