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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9ef90d930382279d9be3a2698898864a770c53f170fc2b1b96c4de490ad3c9' 
  AND token = '3VM0VbsbQGfyfgkp2ojBTGJjJhKU3TTA+nor9JVKS8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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