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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39154ae055915bb39830b9bdefff682b3458b5065c7d5a18d13b2b3b989a6ef' 
  AND token = 'ao2uVG1Hpldn0CMQL+e5TEGD1jTaMNZuIDEq/wHfsh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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