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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c177c7daf6b14ea2f79a8d7d56d4d8f7d178464c566248a40d27c9b2098bb3a0' 
  AND token = '1avzyEOXVDN5nZtq5wvPdLa9VV24iNVJUPingOQsZNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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