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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b44b0016283f0c2b00e2ed446fc959e4d71bc553b4ddc6bc521671cbd616a3' 
  AND token = 'gWneWeu1eCu9+ZmkYcstqaeECwWp/oVUl37pwPthE6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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