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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75db3cc4012b09ff34a00a2e764172bd6f2b288c0d9cd49874ff78b3cc62a60d' 
  AND token = 'Ke+YlHilAqCkipIUsHwE+l+TNgeSeS9ikOLxPIJDHKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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