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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a8d4e113c9f4b3e00baf76f11f71ee525f7c50567a9fb6cec22919b116e652' 
  AND token = 'z4c+JNvmunyX82z6IOZnDPSc9c+XPWwa7q7QRIyBwg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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