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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c6e723c7d7ad6b17eea86870ff6d380f4b30599b10236a8c2e550a39ae72cf' 
  AND token = 'tAob39wRG/JqYvg6EG9OEsExHfmLDy3G6NodYRGWWC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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