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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b01c591e2e5cf19d5768bc84e5212b0bfff0be7e409925a043979feb16f34a' 
  AND token = 'ulkNs9kv1ecgSBXaztraGlYGNcu/ku2hn/7m78ee0Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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