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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5160bf70ec3be3db59cb1fa56a3478fbdfd47e15d1e56b6df99e8b5862b8fc' 
  AND token = 'bBDMRcWbLyCa+RbHSJ4BN+EOlsGTayXiOQi6AEvQ2nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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