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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc92750f21c79025c23edc78041bdf551ada29b4a52f34947a4bc20977beac64' 
  AND token = 'm/3odFbQnT6lYz88Dg0YqLeTVD2M90glC9pS46CEomI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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