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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e51033f2a7cd8e95e0858c49da6e715fd4f9299566f3e5b6f89d0fc4ca71df' 
  AND token = '0NjCoDxRrYzNIFha6L0AJ7O0WTSotCiomW/mNYz+dkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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