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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e373e37246c6ed0034cabc30133ceb674a94136cc97536a6452f585629dd6402' 
  AND token = '0Zr6d6DHWzoR/KJ+spfemSmdiPBI3Z/oH9ht825tQfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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