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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8922292f820c643e343798d4102ec7e61c8bbb9d546e671614e5d7aca5612862' 
  AND token = 'RHKrwHAhIMZ4QRDM38lg6T6kVqwt1JlYhJf6gkGSZ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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