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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0520ea92747f81edb6d29e3a85b44febb8603ac9b4d4060dcc81f89a80dd662' 
  AND token = 'D9VzXt7gVLFuZJkb7dYe0nDTBc1x1tc1jo6PTVvkDCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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