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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92a5371a329a6ad1e835070d26e84ae16fffeeffd5b4b8fdcd1635ec01b99ae' 
  AND token = 'Pwxj5l2UdSBW0Fcdtz5VvUuvLd6+0wiePcyL21WFQF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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