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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc9bddf8a7a5f8486de5f32e2e9694a87e4fd87fec19a1c0a20acb3cae73ff8' 
  AND token = 'UkZKmJSKeXS+sE4sJtoUhPQf4yIRMomQb840ZiqhRWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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