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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f535375d0fcc67da2c79e7d953eb4d4382e11333b169c0ea2242a975049ca6dc' 
  AND token = '98YJFYv5f5cTKk69BfY6urgz+aKYVFVIDjnK98aO/HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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