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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af4b9ad58ef0e75d932598ca79f926e573fb78b0f2385067ce182f069eaed4c' 
  AND token = 'DvGOt+5va3lKj3msSQqXcY9U+cKd2rCtj2HvBpGOTpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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