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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d71743f78a9b303459df9e1d67c084017c52bc9dd07d14b8cd4909e649e09d' 
  AND token = 'Srzssdbjl5zTNQlEKaH/gxrAtqLfM5VB6sbF3YEqeuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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