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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a10b6de5e687e815a0d0e9b36a5bb6c6d084a9ac0d8ef1589346e73e4577ef' 
  AND token = 'R6k6dbrJ2Z4DwJvCWYOFc17qJzsVUb0GfQv+T/QT5f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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