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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d121029e75564e16f1d42087895c970f0e815c0aa47094ac6ae6b14db3f3e5d' 
  AND token = '+SBRK7IGSQEJiZxn1QOMm+xnPVXMs62esxEH8SQiRVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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