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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebed6cf5e39b8472a7d6ac6d3ad59d3dfc5e7098ffd62ead69e62a08ae7973f0' 
  AND token = '1a+ttDNzJxicvPpUuT1tJdBpPsY/U46XwqmWQzR9odc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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