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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4ca65d3a5ee7898a17e16925f37dd8665f24773773a61f17d6ad22d76a20fa' 
  AND token = 'mlf811aBhQwIH5sHFTUT/jVPpMRsDPkJYc5U4woSY9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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