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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba5d4da9ea263936e0ac34c1598b3fe284d8768e5930dcdcd56a3edd2adbfb7' 
  AND token = '7HCFn2heNi3EMBPl389JwSMTP4yUvefIEVsKqv78UXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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