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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ca56544a277295c7ea3753c546335c3f8845d4f631e07b85c32c63b6e15c4c' 
  AND token = 'O1Vm2ADXfnq7Z9WF2uDKHP/v7U3oIH1hRut7zzh74Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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