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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f8a4a70e558393903b19c7fdda4558019307e08e51350ab5fb215c74876e75' 
  AND token = 'fy9/tuusR/+Hd06IKDBDOnF+Yrl4kd5VF6jSS50u8V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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