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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cba780e0fbf7ce8c7dfa0c3bb7c693e8c3a55b9e0a59c0be7f11fa63d24791c' 
  AND token = 'rSNevEaEz+KCzEW18tTctDJ+kT8R1qNJA/wibByUF/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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