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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519a24fc154f8a02d8f2a15d5e8ccb8c8dc8a4098fbc5c33f3cdd00d29cc4d79' 
  AND token = 'irHK6HS4/jBhG9gd+XRoUPM02HodHmmmX5kUcflnAe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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