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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa1d3cb10119c92e0ec60a3f3ccb90b4c76735704292f971313cfc4bd8b0baa' 
  AND token = 'QKN2oQXrXJKaMR/Mjz8ZMM3wn8hfIeXRrJ+xSUzK6Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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