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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030ced3871b7c693635a8100179858b18d84e4e1ca224579f29c2a25db87a886' 
  AND token = 'UxWplIOe3VzeKDKaqiSFMtYdJbjLNebRasZ+CLoYUxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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