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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2d0de8ba905a4be65467a7bf4d504565080aff69f79bd7e3b60d5d517dc74d' 
  AND token = 'ZO6zTjN0iVUCSxBhdMdNmlfXy8q/s+7aSa5L+bjp+R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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