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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411a9c70a37defa9b37d96e6a68ce8eea2cb2058b29c92a6de6e435f8a15b5d3' 
  AND token = '/L4Rq2OIRKs7ztr8JjWbcgURMWcnm10TgRinZDurwTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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