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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4573fb2ca724633855a993e5e07b1271dfa96a8ea5e6259d6dd0efe956d0da' 
  AND token = 'AxqVFHVrndJ5DB7iG88/2t8xIU7u/xhP4sq5qkuXC8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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