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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bfe7973c1f17eddcda366f2af819113bc62a51984b306330656205c6c6e6de' 
  AND token = 'yBGfKRDzmA1v4W2EvDVS30/1Awbn2VlWwdm84Y+1gHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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