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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae561ddb964ac6b008fd36d9b22dd3dc4cd293d71e33877e8d8a006973b829c' 
  AND token = 'BBbPhuQY1HomUOy2SHT/nkzLJrKQIWqcJxIM6OZwt1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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