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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e62392b517f51c44733de12de77a6a27d5071c49fc0ffc7a8244480d575a71f' 
  AND token = 'v1vsdYTwVyOlAiCABQ961MmW26dp8BvqF87Dm98HM6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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