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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc5b860bd8d3424e76bfa238d6e7920c573493d31e3ce51527a3bdccff10056' 
  AND token = 'cGceN8RrcroTyGGIQKX3NQuKvJa08/28uoNZQFjbXFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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